4IN1 Gas Sensor Module RS485

    4IN1 gas detection module, mainly for those requiring environmental gas detection in various places, the product contains four types of gas sensors (CO, H2S, O2 and CH4 and other gases can be expanded) and signal processing circuit board. The module has good selectivity and stability. The module can output four signals in real time through the digital serial port the current concentration value of gas. It can be used for handheld devices or fixed devices.Measure the current ambient gas concentration. This module is a mature sensor detection technology.A general- purpose miniaturized product closely combined with sophisticated circuit design products.

Technical Parameter

PIN And Size

Communication protocol RS485: (Customized version)

Baud rate 9600, 8N1, Read data with an interval greater than 0.2 seconds

• Change address command: 00 06 00 00 00 address
• Return command: 0, 6, 0, 2, 0, 1, address, 0
• Read address command: 00 FF 03 04
• Return address format: 00 02 02 00 address 00 00

1) Command message format

Host sends read data command:

(Only 4 data, corresponding to 4 register addresses)

The starting address can only use addresses from the above list, otherwise there will be no response. If the number of data exceeds, there will be no response. For example, if the starting address is 0x0002, the number of data that can be returned can only be 1 or 2. If 3 data are to be returned, there will be no response. Similarly, for address 0x0003, the number of returned data can only be 1. If the number of returned data is 0, there will be no response.

Return data:

One data consists of two bytes. If the required return data is 2, the number of bytes just returned is 4.

    4IN1 gas detection module, mainly for those requiring environmental gas detection in various places, the product contains four types of gas sensors (CO, H2S, O2 and CH4 and other gases can be expanded) and signal processing circuit board. The module has good selectivity and stability. The module can output four signals in real time through the digital serial port the current concentration value of gas. It can be used for handheld devices or fixed devices.Measure the current ambient gas concentration. This module is a mature sensor detection technology. A general- purpose miniaturized product closely combined with sophisticated circuit design products.

Technical Parameter

PIN And Size

Communication protocol UART: (Default version)

Baud rate 9600, 8N1, hexadecimal transmission.

Send frequency: 1 set of data per second, automatically sent.
Data format

Checksum calculation method:
B11 = (char)(B0 + B1 + B2 + ... + B9 + B10);

Attention:

1. The module is connected by terminal blocks, and it is prohibited to weld on the module at will.
2. It is strictly forbidden to replace the sensor attached to the module without permission.
3. If the module is used for the first time or has not been used for a long time, it shall be aged for 24 hours to ensure the accuracy of the sensor.
4. Do not apply this module to systems involving personal safety.
5. The module has been calibrated before leaving the factory. After that, it should be calibrated regularly according to the use and the exposure of the equipment to harmful gases or pollutants.
6. When the module reading exceeds the measurement range, it indicates that the target gas concentration may reach the explosive and seriously dangerous concentration.
7. Avoid exposing combustible gas sensor to lead containing compounds, silicone resin and chlorinated hydrocarbons. Although some organic vapors (such as leaded gasoline and halogenated hydrocarbons) may cause the sensor to be poisoned and temporarily stop normal operation, resulting in reduced sensitivity, most of the time its function can be restored through calibration.
8. If the module is exposed to certain concentration of combustible gas or toxic and harmful air for a long time, the load of the sensor may be increased, which may seriously affect its performance. If the module has ever given an alarm due to ultra-high concentration gas, it shall be recalibrated or returned to the factory to replace the sensor if necessary.
9. In some environments, serious electromagnetic interference may cause data deviation or even fluctuation.